<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>函数参数默认值</title>
</head>

<body>
    <script>
        // ES6允许给函数参数赋值初始值
        // 1.形参初始值,具有默认值的参数,一般位置要靠后(潜规则)
        /* function add(a, b, c = 10) {
            return a + b + c;
        }
        let result = add(1, 2);
        console.log(result); */

        // 2.与解构赋值结合
        function connect(host = "127.0.0.1", username, password, port) {
            console.log(host);
            console.log(username);
            console.log(password);
            console.log(port);
        }
        connect({
            host: 'yxb.com',
            username: 'root',
            password: '123456',
            port: 3306
        })
    </script>
</body>

</html>